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EP0026715A2 - Staudruck-Durchflussmesser - Google Patents

Staudruck-Durchflussmesser Download PDF

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Publication number
EP0026715A2
EP0026715A2 EP80401382A EP80401382A EP0026715A2 EP 0026715 A2 EP0026715 A2 EP 0026715A2 EP 80401382 A EP80401382 A EP 80401382A EP 80401382 A EP80401382 A EP 80401382A EP 0026715 A2 EP0026715 A2 EP 0026715A2
Authority
EP
European Patent Office
Prior art keywords
drag
wire
flow meter
force
vibration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP80401382A
Other languages
English (en)
French (fr)
Other versions
EP0026715A3 (de
Inventor
James Wilson Buike
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bendix Corp
Original Assignee
Bendix Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bendix Corp filed Critical Bendix Corp
Publication of EP0026715A2 publication Critical patent/EP0026715A2/de
Publication of EP0026715A3 publication Critical patent/EP0026715A3/de
Withdrawn legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/28Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter

Definitions

  • the present invention relates to a drag flow meter.
  • This invention concerns fluid flow meters of the type used to measure various flow parameters as fluid flow velocity and mass rate of flow.
  • a drag flow meter comprising a drag body disposed within the fluid flow in order to generate a drag force thereon, a vibration tension wire connected to the drag body, characterized in that it comprises means for producing an output signal corresponding to the frequency of vibration of said tensioned wire, whereby said output signal varies in frequency in correspondence with the change in frequency of vibration of said tension wire produced by said vibration in said drag force.
  • the drag body is mounted on a pivoted arm, in turn drivingly connected to a tensioned, electrically conductive wire, the tension of which is varied to a degree by the drag force.
  • the tensioned wire is disposed in a magnetic field and an electrical current caused to flow through the wire to produce a vibration of the wire by the force generated by the magnetic field, which varies with the degree of drag exerted on the wire force by the varying of the tension of the wire.
  • the relationship between the tensioning of the wire and the effect on the frequency of vibration is such'that the output signal, i.e. the varying frequency of vibration of the conductor wire, is related linearly to the fluid flow rate over the drag body.
  • the output signal being in the form of a frequency signal is easily digitized to thus achieve the above-recited object of the invention.
  • the wire is preferably disposed within a housing which is sealed so as to enable evacuation thereof and to thus minimize the effects of air dampening on the vibration of the wire.
  • Various mounting arrangements for the wire are disclosed in which the change in tensioning of the wire due to temperature induced variations in the effective length of the mounting arm is minimized.
  • the concept according to the present invention utilizes a tensioned wire arrangement in conjunction with the drag body or target, which tensioned wire is caused to vibrate at a frequency which varies with the drag force.
  • FIG. 1 Such an arrangement is depicted diagrammatically in Figure 1 mounted to a flow passage 10 through which the fluid flow rate is to be determined, and includes a drag body 12 disposed so as to be impinged by the fluid flow and a resultant drag force generated.
  • Tfe drag body 12 is mounted on an arm 14 mounted for pivotal movement about a pivot axis 16.
  • the effective length of the arm section to which the drag body 12 is attached is defined as length L 2
  • the shorter arm section is defined at length L 1 .
  • the arm L 1 is connected to a tensioned conductive wire 18 which is fixed to a pedestal 20 such that as the drag force increases and decreases, the tension of the tensioned wire 18 varies accordingly.
  • the tensioned wire 18 is disposed within a magnetic field established as by permanent magnets 22 and 24 which have poles positioned opposite each other as indicated.
  • the presence of the magnetic field induces a transverse force to be generated acting on the tensioned wire 18 in a manner causing the tensioned wire to be vibrated by the passage of an electrical current therethrough.
  • the magnetic field also generates an output signal consisting of the varying electrical voltage which is induced as the tensioned wire 18 vibrates within the magnetic field.
  • An output signal and current generating circuit is advantageously provided by a conventional feedback control loop circuit, indicated in block diagram form in Figure 1. Since suitable such circuits are very well known in the art, the details of the same are not included here, but typically include an amplifier connected so as to maintain a current in the tensioned wire 18 by feedback of the induced current to the amplifier, and at the same time generating an amplified output signal.
  • Equation (1) becomes : or : which shows that frequency is linear with velocity.
  • the important point to recognize is that the frequency is related to the square root of the tension (Eq. 1). Then, the tension is proportion to the square of the velocity (Eq. 2).
  • Eq. (4) where the frequency is related to the first power of the velocity.
  • the tensioned wire 18 has a fc,-Ce exerted thereon by the p as - sage of a current therethrough in the presence of the magnetic field which will tend to vibrate at the natural frequency which is a fu nc - tion of the wire tension.
  • Figures 2, 3 and 4 depict an actual implementation of the concept of a flow meter depicted diagrammatically in Figure 1.
  • the tensioned wire 18 is preferably vibrated in a vacuum since the presence of the surrounding atmosphere tends to produce an undesirable damping of the wire vibration which will disturb the calibration of the meter.
  • the flow meter 26 depicted in Figure 2 is provided with a housing 28 and mating cover 30 which is secured over the housing 28 with a seal 32 provided such that a vacuum may be established within the interior of the housing 28 through an evacuation port 34, closed off after evacuation by a sealing screw 36.
  • the housing 28 is provided with a pedestal 38 which is secured by means of threaded fasteners 40 to the fluid flow conduit 42.
  • a drag flow body 44 is disposed within the interior of the fluid flow conduit 42 and is mounted on a force arm 46 which extends through an opening 48 formed in the fluid flow conduit 42.
  • the housing cover assembly includes a sealing bellows 52 preferably of thin flexible metal which is sealed to the exterior of the force arm 46 and to the interior of the bore 54 formed in the housing 28.
  • the force arm 46 is pivotally mounted by a pair of bearings 56 carried by the force arm 46 and engaged by tapered pivot pins 58 carried by the openings formed in the housing 28 and retained by means of threaded lugs 60.
  • the force arm 46 is overhung about the pivot point and has a bifurcated section 62, which carries an end fitting 64 secured to a length of electrically conductive wire.
  • a high tensile strength material such as tungsten is preferred since the wire 66 is pretensioned to relatively high stress levels.
  • wire 66 At the opposite end of wire 66 is an end fitting 70 which is received within an insulated bushing 72 of an electrically insulating material such as boron nitride.
  • a tensioning adjustment nut 74 threadedly engages the end fitting 70 and presets the tension level of the wire 66.
  • a support block 76 is also received within the interior bore of the housing 28 having a projecting boss portion 77 upon which is mounted a ferromagnetic yoke 78, which is keyed over the boss portion 77.
  • the boss portion 77 supports the insulated bushing 72.
  • the ferromagnetic yoke 78 serves to provide a mounting for a pair of opposite pole oriented magnets 80 and 82 which are disposed at the ends with the wire 66 passing between the ends.
  • Each of the magnets 80 and 82 is supported on an arm opposite the ferromagnetic yoke 78, and threaded fasteners 84 and 86 allow adjustment of the intermediate gap.
  • the wire 66 is diposed in a magnetic field such that an electrical current will generate a force acting on the wire tending to establish a transversely directed vibration of the wire 66, the frequency of which is a function of the tension of the wire, which in turn corresponds to the force acting on the drag flow body 44 by the fluid flow.
  • the drag force being a function of the suare of the velocity of the fluid flow
  • the vibration frequency being a function of the square root of the wire tension
  • the housing 28 and force arm 46 are preferably constructed of metal exhibiting coefficients of expansion closely matched to that of the wire, such as molybdenum.
  • feed through connectors 88 are employed which are in turn adapted to be connected to short electrical leads (not shown) extending from either end of the wire 66.
  • the drag flow meter device is applicable to pipe flow monitoring applications and may also be applied to ducted flow meter applications such as for oceanographic and limno- logical studies, or for a vane oriented wind velocity sensor.
  • a duct 90 is provided to which is mounted a flow meter 92 according to the present invention.
  • a drag disc plate 94 is provided secured to a force arm 96.
  • Various sizes of drag discs may be provided to afford many different flow rate ranges and differing fluid densities.
  • a two-part enclosure defined by an endcap 98 and cover 100 are provided which enables a vacuum to be maintained within the interior for the purposes described above.
  • a soft foam annular sealing disc 104 is provided in order to maintain the vacuum throughout the slight excursion of force arm 96.
  • the force arm 96 is pivotally supported at a point intermediate its length between a pair of clevises-106 with an upper bifurcated end section 108 supporting a wire fitting 110 to which is secured a length of tungsten wire 112.
  • Support body 114 is secured to the endcap 98 by a pair of cap screws 116 and serves to mount the opposite end of the support body 114, which holds an insulating bushing 118.
  • Insulating bushing 118 receives the opposite end of the wire 112 with an end fitting 120 secured to the opposite end, being threadably engaged with a tension adjusting nut 112. Insulating bushing 118 is locked in position by means of a set screw 124.
  • the support body 114 also serves to mount a pair of opposed cylindrical permanent magnets 126 and 128 having oppositely directed polarities which are justaposed with a gap therebetween so as to establish a magnetic field through which the wire 112 passes.
  • the mounting of the magnets 126 and 128 is by means of threaded elements 130 and 132 which control the position of the magnets in respective bores 134 and 136 formed in plug bushings 138 and 140, respectively.
  • An access plug 142 is provided to enable the tension adjusting nut 122 to be reached through the end of the cover 100.
  • Electrical leads 144 and 146 are secured to either end of the wire 112 and are passed out through a sealing grommet 148.
  • the object of the present invention has been achieved by the disclosed drag flow meters, which produce an electrical output signal which is easily digitized by the use of counters and is thus compatible with digital signal processing circuits.
  • the offsetting relationship between the variation in frequency with tension and the increasing drag force with fluide flow velocity produces an essentially linear relationship between fluid flow and the output signal constituted by the varying frequency electrical signal.
  • the arrangement itself is relatively simple and rugged and, accordingly, is compatible with many fluid flow measuring applications.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
EP80401382A 1979-10-01 1980-09-30 Staudruck-Durchflussmesser Withdrawn EP0026715A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/080,862 US4291583A (en) 1979-10-01 1979-10-01 Drag flow meter
US80862 1979-10-01

Publications (2)

Publication Number Publication Date
EP0026715A2 true EP0026715A2 (de) 1981-04-08
EP0026715A3 EP0026715A3 (de) 1984-04-04

Family

ID=22160118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80401382A Withdrawn EP0026715A3 (de) 1979-10-01 1980-09-30 Staudruck-Durchflussmesser

Country Status (4)

Country Link
US (1) US4291583A (de)
EP (1) EP0026715A3 (de)
JP (1) JPS5651616A (de)
CA (1) CA1136879A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0287850A1 (de) * 1987-04-09 1988-10-26 Walter Beck Gmbh & Co. Kg Sensor zur Erfassung der Strömung einer Flüssigkeit in einer Rohrleitung

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643213A (en) * 1984-08-03 1987-02-17 Techrad Corporation Method and apparatus for controlling leaks in pressurized fluid systems
US4679445A (en) * 1986-02-03 1987-07-14 The Babcock & Wilcox Company On-line replacement sensor assembly for a vortex shedding flowmeter
FI75424C (fi) * 1986-03-18 1988-06-09 Valmet Oy Genomfoerningskonstruktion i en maetanordning.
US4841782A (en) * 1987-09-11 1989-06-27 Dwyer Instruments, Inc. Target fluid flow indicator gauge
DE19726551A1 (de) * 1997-06-23 1998-12-24 Buehler Ag Speisesensorik
GB2421573B (en) * 2004-12-23 2009-09-23 Schlumberger Holdings Apparatus and method for formation evaluation
US7194902B1 (en) * 2004-12-23 2007-03-27 Schlumberger Technology Corporation Apparatus and method for formation evaluation
US7222671B2 (en) * 2004-12-23 2007-05-29 Schlumberger Technology Corporation Apparatus and method for formation evaluation
US7389684B2 (en) * 2005-11-03 2008-06-24 Roy Jude B Gas lift flow surveillance device
US10704935B2 (en) 2016-12-04 2020-07-07 Buoy Labs, Inc. Fluid flow detector with tethered drag block
USD866375S1 (en) 2017-08-02 2019-11-12 Buoy Labs, Inc. Water flow monitoring device
US11781895B2 (en) 2018-02-23 2023-10-10 Buoy Labs, Inc. Fluid flow analysis and management

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE567788A (de) *
CH303703A (fr) * 1952-07-16 1954-12-15 Coyne Andre Procédé de mesure de la tension mécanique d'au moins deux fils parallèles et dynamomètre pour la mise en oeuvre de ce procédé.
US3426593A (en) * 1965-12-23 1969-02-11 Robert B Jacobs Vibrating transducer for flow and related measurements
US3608374A (en) * 1969-03-18 1971-09-28 Honeywell Inc Mass flowmeter
US3789673A (en) * 1971-10-27 1974-02-05 G Berlin Pickup of the angular speed of a rotating object
DE2842007A1 (de) * 1978-09-27 1980-05-08 Mirahmadi Amin Quadratisches kraft-stellglied mit drehsymmetrischer kennlinie
DE2928568A1 (de) * 1979-07-14 1981-01-29 Bosch Gmbh Robert Verfahren und vorrichtung zur bestimmung der staerke eines massenstroms

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE195794C (de) *
US2546158A (en) * 1944-09-30 1951-03-27 Sperry Corp Gyroscopic instrument
US2778905A (en) * 1951-08-13 1957-01-22 Statham Lab Inc Motion sensing device
US3067615A (en) * 1959-08-10 1962-12-11 Borg Warner Condition responsive apparatus
US3114261A (en) * 1959-09-03 1963-12-17 Richard C Dillon Strain wire flowmeter
US3238773A (en) * 1962-03-16 1966-03-08 Jr Leonard P Leigh Deflectable probe type transducer
US3530714A (en) * 1968-02-21 1970-09-29 Foxboro Co Target flowmeter
US4118977A (en) * 1976-10-13 1978-10-10 The Foxboro Company Electric signal transmitter for vibrating-wire sensor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE567788A (de) *
CH303703A (fr) * 1952-07-16 1954-12-15 Coyne Andre Procédé de mesure de la tension mécanique d'au moins deux fils parallèles et dynamomètre pour la mise en oeuvre de ce procédé.
US3426593A (en) * 1965-12-23 1969-02-11 Robert B Jacobs Vibrating transducer for flow and related measurements
US3608374A (en) * 1969-03-18 1971-09-28 Honeywell Inc Mass flowmeter
US3789673A (en) * 1971-10-27 1974-02-05 G Berlin Pickup of the angular speed of a rotating object
DE2842007A1 (de) * 1978-09-27 1980-05-08 Mirahmadi Amin Quadratisches kraft-stellglied mit drehsymmetrischer kennlinie
DE2928568A1 (de) * 1979-07-14 1981-01-29 Bosch Gmbh Robert Verfahren und vorrichtung zur bestimmung der staerke eines massenstroms

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
MACHINE DESIGN, vol. 49, no. 23, October 1977, page 48, Penton Inc., Cleveland, US *
THE OIL AND GAS JOURNAL, vol. 52, no, 6, 15th June 1953, page 172, chapter 32, The Petroleum Publ., Co., Tulsa, Okla., US *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0287850A1 (de) * 1987-04-09 1988-10-26 Walter Beck Gmbh & Co. Kg Sensor zur Erfassung der Strömung einer Flüssigkeit in einer Rohrleitung
DE3712023A1 (de) * 1987-04-09 1988-10-27 Walter Beck Gmbh Mess Und Rege Sensor zur erfassung der stroemung einer fluessigkeit in einer rohrleitung

Also Published As

Publication number Publication date
US4291583A (en) 1981-09-29
EP0026715A3 (de) 1984-04-04
JPS5651616A (en) 1981-05-09
CA1136879A (en) 1982-12-07

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19801003

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Effective date: 19840402

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Inventor name: BUIKE, JAMES WILSON